The PS8461 is a multiplexing chip that allows the selection between one of two dual mode DisplayPort inputs that are jitter-cleaned and repeated at the output.
Taiwanese interface IC supplier Parade Technologies has introduced two new chips, expanding options for video transport demultiplexing/multiplexing and signal conditioning for Dual-Mode DisplayPort 1.4 in personal computers, workstations and other high-resolution video device applications.
The PS8461 is a multiplexing or “mux” chip that allows the selection between one of two dual mode DisplayPort inputs that are jitter-cleaned and repeated at the output. The PS8469 is a demultiplexing, or "demux" chip that allows a single Dual-Mode DisplayPort 1.4 input to be outputted either as a Dual-Mode DisplayPort 1.4 output or an HDMI 2.0b output, each being jitter-cleaned. Both devices support DisplayPort 1.4 HBR3 8.1Gbps and HDMI 2.0b 6Gbps data rates.
For systems supporting DisplayPort 1.4, the new PS8461 and PS8469 provide the platform designer a means to address the increasingly common need for multiple GPUs and/or additional video display and external connection options. The PS8461 2:1 mux is ideal for personal computer systems that utilise multiple GPUs, as it can be used to select which GPU will drive a video output connector or embedded display. The PS8461 can also be applied in displays or docking stations to select alternate video inputs.
Figure 1: PS8461 block diagram. (Source: Parade Technologies)
The PS8469 is ideal for video devices that require both a DisplayPort output, including DisplayPort 1.4 with Dual-Mode support, and an HDMI 2.0b output. The chip accepts a single Dual-Mode DisplayPort 1.4 input and can provide either a repeated, jitter-cleaned, Dual Mode DisplayPort 1.4 compliant output from one output port, or a jitter-cleaned, level-shifted, HDMI 2.0b compliant output from another port.
Figure 2: PS8469 block diagram (Source: Parade Technologies)
While providing new video channel routing options, the PS8461 and PS8469 are similar to Parade’s previously announced PS8460 and PS8468 in that they provide jitter-cleaning signal conditioning and they support DisplayPort 1.4 with dual-mode operation. This means that in addition to supporting native DisplayPort up to the HBR3 8.1Gbps link rate, the highest transport rate specified for DisplayPort 1.4, the devices also support HDMI at TMDS link rate up to 6Gbps, the maximum for HDMI 2.0b. The jitter-cleaning repeater function, which utilises a retimer circuit, is automatically applied to either the DisplayPort or HDMI protocols, whichever is received on the input. No external crystal or reference clock is required.
The PS8461 and PS8469 also implement configurable and automatic input equalisers to compensate for channel losses, according to the company. The devices have a very low standby power consumption of less than 50mW.
The PS8461 and PS8469 devices are packaged in a 5mm x 10mm 66-pin QFN which is RoHS compliant and halogen-free.